150 CRUSTACEA. DECAPODA. 



G. pictus, Lam. Shell and feet red, variegated with white ; shell 

 broader than long, with the sides slightly bent outwards in the 

 middle, and bidentated before ; front in four flattened and den- 

 tated lobes ; claws short, with the toes spoon-shaped ; general 

 colour blood-red, dotted or striped with yellow. Inhabits shores 

 of South America Herbst, pi. 3, fig. 33. 



Gen. 8. GONOFLAX, Leach. Cancer, Lin. 

 Exterior antennae setaceous and distinct, with the three first 

 joints thicker than the others ; exterior feet-jaws approximat- 

 ed, with the fourth joint inserted at the interior and upper 

 angle of the third, which is pentagonal and transverse ; an- 

 terior pair of legs very long, the forceps elongated and equal ; 

 eyes terminating their peduncle. 



The animals of this genus inhabit the ocean, and burrow in the clay or slime. 

 G. bispinosa, Leach. (C. angulatus, Penn.) Shell with two spines 

 on each side ; arms above and wrists internally uith one spine. 

 Coasts of France and England Pen. Brit. ZooL iv. pi. 5, fig. 2. 



G. rhomboides, Lat. Shell yellow, with rose-coloured reflections ; 

 differs from the preceding in wanting the second lateral spine. 

 8 lines long and 16 broad before. Inhabits Mediterranean sea. 

 Desm, Crust. 125. 



Gen. 9- THELPHUSA, Lat. Gecarcinus, Lam. 

 Exterior antennae very short, and inserted near the ocular pe- 

 duncles ; jaw-feet approximated, and covering the mouth ; 

 forceps almost equal, large ; hands oval, granular ; the third 

 pair of feet longest ; shell depressed, smooth, cordiform, trun- 

 cated posteriorly, with an impression in the form of an H in 

 the middle ; eyes on short and thick peduncles, lateral. 



The animal which forms the type of this genus inhabits fresh waters in the an- 

 cient continent, and was known to the early Greek writers. It is found in Italy in 

 streams and lakes. 



T.fluviatilis, Lat. Shell long and broad, smooth, with the ante- 

 rior sides wrinkled ; anterior feet rough with asperities ; hands 

 strong, oval, with the toes almost equal, conical, and unequally 

 dentated along the interior border, with a reddish spot at their 

 extremity ; shell grayish, whitish, or livid. Inhabits rivers in 

 Europe, &c. Desm. Crust. 128. 



Gen. 10. EUIPHIA, Lat. Cancer, Fab. 

 Exterior antennae pretty long, distant from the origin of the 

 ocular peduncles, and inserted near the anterior margin of 

 the shell ; forceps thick, unequal ; feet slightly compressed, 

 with scattered bristles, and terminated by striated, almost 

 straight claws ; shell truncated, cordiform, with the sides and 

 anterior margin spinous ; eyes separate, on short peduncles. 

 J3. spinifrons, Lat. Shell smooth, with five teeth on each side, of 

 the second and third are bifid ; front and hands spinous ; 



